I am looking for top layer moss or bedding advice for a planted vivarium housing an arboreal snake (Vine Snake).

The cage has a bottom layer of ceramic rock, an intermediate layer of fiberglass screening and a top layer of Jungle Mix potting soil. There are Schefflera plants, bleached (air dried) branches in the cage and some dead plant leaves scattered on the substrate.

Does anyone recommend a good quality live moss? Any other suggestions?